Afirm has a net profit margin of 20 percent on sales of $20,000,000. If the firm has total liabilities of $7,500,000, total assets of $22,500,000, and an after-tax interest cost on total debt of 6 percent, what is the firm's ROE? Greater than 0.30 Between 0.20 and 0.30 Between 0.10 and 0.20 Less than 0.10 O Cannot be determined with this information